Magnetism And Matter — Physics STD 12 Science — Question

A deuteron of kinetic energy 50 keV is describing a circular orbit of radius 0.5 metre in a plane perpendicular to the magnetic field B. The kinetic energy of the proton that describes a circular orbit of radius 0.5 metre in the same plane with the same B is:

The force between point charges kept in vacuum is 18 Newton. If a glass plate of dielectric constant 6 is placed between these charges, then the value of force will be:

A medium is said to be dispersive, if(a) Light of different wavelengths propagate at different speeds(b) Light of different wavelengths propagate at same speed but has different frequencies(c) Light is gradually bent rather than sharply refracted at an interface between the medium and air(d) Light is never totally internally reflected

In a Young’s double slit experiment, the slit separation is 0.2 cm, the distance between the screen and slit is 1m. Wavelength of the light used is 5000 Å. The distance between two consecutive dark fringes (in mm) is(a) 0.25   (b) 0.26(c) 0.27   (d)  0.28

Two identical charged spherical drops each of capacitance C merge to form a single drop. The resultant capacitance is(a) Equal to 2C (b) Greater than 2C (c) Less than 2C but greater than C(d) Less than C

For the structural analysis of crystals, X-rays are used because(a) X-rays have wavelength of the order of interatomic spacing(b) X-rays are highly penetrating radiations(c) Wavelength of X-rays is of the order of nuclear size(d) X-rays are coherent radiations

Carbon dating is best suited for determining the age of fossils if their age in years is of the order of

The process by which a heavy nucleus splits into light nuclei is known as(a) Fission(b) α- decay(c) Fusion(d) Chain reaction